turbo's and heat

[zx2guy]

little concept i seem to not understand... how does exhaust heat, make the turbo spin? i thought the turbo heated up to "running temp" like the motor, then it was at max efficiency. then when you step on the gas the expanded exhaust gas (from the "bang" cycle so to speak) spun the turbo. if you need the whole story check it out:
http://www.automotiveforums.com/vbul...6&goto=newpost

it could be how they are explaining it, but i dont see how heat (nothing more) plays the bigger role in the turbo spinning then the exhaust gasses.

[95_GSX]

There were quite a few people there that didn't know what they were talking about, and a couple that did.

Its not the heat from the exhaust gas, its the expansion of the exhaust gas as it leaves the motor that spins the turbine wheel on the exhaust side of the turbo. The turbine wheel has a shaft in the center that runs through the center section and connects to the compressor wheel. As the turbine wheel speeds up so does the compressor wheel, as the compressor wheel spins faster it "sucks" more air into the turbo. The compressor works by intaking air through the fins of the compressor wheel, and because its spun by the turbine wheel, centrifugal force "throws" the air to the outside of the wheel. The wheel sits inside a housing and collects all this air that the compressor wheel is moving and condenses(compresses) it. virtually all of the heat that is caused by a turbo is caused in this condensing/compression process. very little heat is transferred through the center section of the turbo from the turbine side. now you have pressure in the intake manifold. there is a lot more to it but i hope this clears it up for you. Also next time if you need a mechanical explanation of how something works. Check out this site first.www.howstuffworks.com
i linked to the turbo explanation page, check it out it will explain it better than i did.

[Blackcrow64]

Originally Posted by 95_GSX

Check out this site first.www.howstuffworks.com
i linked to the turbo explanation page, check it out it will explain it better than i did.

I love that site. Its perfect for teaching about turbos. I show it to anyone that ever asks me about it... Maybe it should be a "stickied link" lol